DE102005028723A1 - Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material - Google Patents
Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material Download PDFInfo
- Publication number
- DE102005028723A1 DE102005028723A1 DE102005028723A DE102005028723A DE102005028723A1 DE 102005028723 A1 DE102005028723 A1 DE 102005028723A1 DE 102005028723 A DE102005028723 A DE 102005028723A DE 102005028723 A DE102005028723 A DE 102005028723A DE 102005028723 A1 DE102005028723 A1 DE 102005028723A1
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- DE
- Germany
- Prior art keywords
- measuring
- medium
- measuring tube
- measuring electrode
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 23
- 230000001939 inductive effect Effects 0.000 title abstract description 5
- 238000011156 evaluation Methods 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 4
- 230000000875 corresponding effect Effects 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims description 2
- 230000002123 temporal effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 2
- 230000006870 function Effects 0.000 claims 1
- 239000002800 charge carrier Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012811 non-conductive material Substances 0.000 description 2
- 238000001139 pH measurement Methods 0.000 description 2
- 238000009428 plumbing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Die Erfindung betrifft ein magnetisch-induktives Durchflussmessgerät mit einem Messrohr, das von einem Medium im wesentlichen in Richtung der Messrohrachse durchflossen wird, mit einer Magnetanordnung, die ein das Messrohr durchsetzendes und im wesentlichen senkrecht zur Messrohrachse verlaufendes alternierendes Magnetfeld erzeugt, mit einer ersten Messelektrode und mit einer zweiten Messelektrode, wobei die Messelektroden im Messrohr auf einer Verbindungslinie positioniert sind, die im wesentlichen senkrecht zur Messrohrachse und zum Magnetfeld ausgerichtet ist, und mit einer Auswerte-/Regeleinheit, die anhand der an den Messelektroden abgegriffenen Messspannung den Volumen- bzw. den Massedurchfluss des Mediums durch das Messrohr bestimmt.The The invention relates to a magnetic-inductive flowmeter with a Measuring tube, that of a medium substantially in the direction of the measuring tube axis is flowed through, with a magnet assembly, the a measuring tube passing through and extending substantially perpendicular to the measuring tube axis generated alternating magnetic field, with a first measuring electrode and with a second measuring electrode, wherein the measuring electrodes in Measuring tube are positioned on a connecting line, which is essentially aligned perpendicular to the measuring tube axis and the magnetic field, and with an evaluation / control unit, based on the at the measuring electrodes tapped measuring voltage the volume or the mass flow of the medium determined by the measuring tube.
Magnetisch-induktive
Durchflussmessgeräte nutzen
für die
volumetrische Strömungsmessung
das Prinzip der elektrodynamischen Induktion aus:
Senkrecht
zu einem Magnetfeld bewegte Ladungsträger des Mediums induzieren
in gleichfalls im wesentlichen senkrecht zur Strömungsrichtung des Mediums angeordnete
Messelektroden eine Spannung. Diese in die Messelektroden induzierte
Messspannung ist proportional zu der über den Querschnitt des Messrohres
gemittelten Strömungsgeschwindigkeit des
Mediums; sie ist also proportional zum Volumenstrom. Bei bekannter
Dichte des Mediums lässt
sich darüber
hinaus eine Aussage über
den Massestrom des durch das Messrohr strömenden Mediums machen. Die
Messelektroden sind üblicherweise
mit dem Medium galvanisch oder kapazitiv gekoppelt.Magnetic-inductive flowmeters use the principle of electrodynamic induction for volumetric flow measurement:
Vertical charge carriers of the medium, which are moved perpendicularly to a magnetic field, induce a voltage in measuring electrodes arranged essentially perpendicularly to the flow direction of the medium. This measuring voltage induced in the measuring electrodes is proportional to the mean flow velocity of the medium over the cross section of the measuring tube; it is therefore proportional to the volume flow. In the case of a known density of the medium, it is also possible to make a statement about the mass flow of the medium flowing through the measuring tube. The measuring electrodes are usually galvanically or capacitively coupled to the medium.
Aus
der US-PS 5,677,496 ebenso wie aus der
In
der
Problematisch
bei der in der
Der Erfindung liegt die Aufgabe zugrunde, ein magnetisch-induktives Durchflussmessgerät so auszugestalten, dass die elektrochemische Störspannung an den Messelektroden des Durchflussmessgeräts unabhängig ist vom Referenzpotential.Of the Invention is based on the object, a magnetic-inductive Flowmeter in such a way that the electrochemical interference voltage at the measuring electrodes of the flowmeter independently is from the reference potential.
Die Aufgabe wird gemäß einer ersten Ausführungsform des erfindungsgemäßen magnetisch-induktiven Durchflussmessgeräts dadurch gelöst, dass die erste Messelektrode aus einem ersten Material A gefertigt ist, dass die zweite Messelektrode aus einem von dem ersten Material A unterschiedlichen zweiten Material C gefertigt ist, dass die Regel-/Auswerteeinheit den Gleichspannungsanteil der an den beiden Messelektroden jeweils gegenüber einem Referenzpotential abgegriffenen Spannung ermittelt und dass die Regel-/Auswerteeinheit anhand des Gleichspannungsanteils eine mediumsspezifische Information zur Verfügung stellt. Bevorzugt handelt es sich bei dem Referenzpotential um das Erdpotential.The object is achieved according to a first embodiment of the electromagnetic flowmeter according to the invention in that the first measuring electrode is made of a first material A, that the second measuring electrode is made of a different from the first material A second material C, that the control / Evaluation unit determines the DC voltage component of each of the two measuring electrodes tapped from a reference potential voltage and that the control / evaluation unit based on the DC voltage component a medium speci information is available. The reference potential is preferably the earth potential.
Die Aufgabe wird gemäß einer zweiten Ausführungsform des erfindungsgemäßen magnetisch-induktiven Durchflussmessgeräts dadurch gelöst, dass die erste Messelektrode aus einem ersten Material A gefertigt ist, dass die zweite Messelektrode aus einem von dem ersten Material A unterschiedlichen zweiten Material C gefertigt ist, dass die Regel-/Auswerteeinheit die Gleichspannungsdifferenz zwischen den beiden Messelektroden ermittelt und dass die Regel-/Auswerteeinheit anhand der Gleichspannungsdifferenz eine mediumsspezifische Information zur Verfügung stellt. Um den Messfehler zu verringern, kann die Regel-/Auswerteeinheit den Gleichspannungsanteil bzw. die Gleichspannungsdifferenz gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen Durchflussmessgeräts über mehrere Messperioden mitteln.The Task is done according to a second embodiment of the magnetic-inductive according to the invention Flowmeter solved by the first measuring electrode is made of a first material A. is that the second measuring electrode of one of the first material A different second material C is made, that the control / evaluation unit the DC voltage difference between the two measuring electrodes determined and that the control / evaluation unit based on the DC voltage difference provides media-specific information. To the measurement error To reduce, the control / evaluation unit, the DC component or the DC voltage difference according to an advantageous development the flowmeter according to the invention over several Average measuring periods.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäßen magnetisch-induktiven Durchflussmessgeräts handelt es sich bei der mediumsspezifischen Information um eine physikalische Größe oder um eine elektrochemische Größe handelt. Im Falle der elektrochemischen Größe wird bevorzugt die Ionenkonzentration, ein elektrochemisches Potential oder der pH-Wert des Mediums bestimmt. Als physikalische Größe wird beispielsweise Information über die Impedanz oder die Leitfähigkeit des durch das Messrohr strömenden Mediums bereitgestellt.According to one advantageous development of the magnetic-inductive flowmeter according to the invention is the medium-specific information is a physical one Size or is an electrochemical size. In the case of electrochemical size, preference is given to the ion concentration, determines an electrochemical potential or the pH of the medium. As physical size becomes for example, information about the impedance or the conductivity of the flowing through the measuring tube Medium provided.
Als besonders vorteilhaft wird es in Zusammenhang mit der vorliegenden Erfindung erachtet, wenn aufgrund von Historiendaten Information über Änderungen am Messgerät oder im Prozess zur Verfügung gestellt werden. Hierzu ist gemäß einer Ausgestaltung des erfindungsgemäßen magnetischinduktiven Durchflussmessgeräts eine Speichereinheit vorgesehen, in der die ermittelte mediumsspezifische Information oder die Information über den Gleichspannungsanteil in Abhängigkeit von der Zeit gespeichert ist; anhand einer zeitlichen Änderung der mediumsspezifischen Information wird eine Meldung bereitstellt, die mit einer entsprechend vorgegebenen Änderung am Durchflussmessgerät oder im Prozess korreliert ist. Insbesondere ist in der Speichereinheit mindestens ein Sollwert für die mediumsspezifische Information abgespeichert; über- oder unterschreitet der gemessene oder ermittelte Istwert den Sollwert oder eine um den Sollwert vorgegebene Toleranz, so wird eine entsprechende Meldung ausgegeben, abgespeichert oder an eine übergeordnete Leitwarte weitergeleitet.When it is particularly advantageous in connection with the present Invention, if, based on history data, information about changes on the meter or in the process be put. This is according to a Embodiment of the magnetic inductive according to the invention Flowmeter a storage unit is provided in which the determined medium-specific information or the information about the DC component depending on is stored by the time; based on a temporal change the medium-specific information is provided with a message with a correspondingly predetermined change to the flowmeter or in the Process is correlated. In particular, at least in the storage unit a setpoint for the medium-specific information is stored; over- or the measured or determined actual value falls below the nominal value or a tolerance specified by the setpoint, a corresponding Message issued, stored or forwarded to a higher-level control room.
Die Erfindung wird anhand der nachfolgenden Figuren näher erläutert. Es zeigt:The The invention will be explained in more detail with reference to the following figures. It shows:
- a) ohne Referenzelektrode und
- b) mit Referenzelektrode;
- a) without reference electrode and
- b) with reference electrode;
Die
Figuren
Das
Messrohr
In
den beiden seitlichen Bereichen des Messrohrs
Infolge
des im wesentlichen senkrecht zur Strömungsrichtung des Mediums
Das
Messrohr
Wie
aus der
In
den beiden dargestellten Varianten des erfindungsgemäßen Durchflussmessgeräts
Über Verbindungsleitungen
Der
Regel-/Auswerteeinheit
- 11
- DurchflussmessgerätFlowmeter
- 22
- Messrohrmeasuring tube
- 33
- Messelektrodemeasuring electrode
- 44
- Messelektrodemeasuring electrode
- 55
- Referenzelektrodereference electrode
- 66
- Elektromagnetelectromagnet
- 77
- Elektromagnetelectromagnet
- 88th
- Verbindungsleitungconnecting line
- 99
- Verbindungsleitungconnecting line
- 1010
- Verbindungsleitungconnecting line
- 1111
- Mediummedium
- 1212
- Regel-/AuswerteeinheitControl / evaluation unit
- 1313
- Verbindungsleitungconnecting line
- 1414
- Ausgabeeinheitoutput unit
- 1515
- Speichereinheitstorage unit
- 1616
- MessrohrachseMeasuring tube axis
- 1717
- A/D WandlerA / D converter
- 1818
- A/D WandlerA / D converter
Claims (9)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005028723A DE102005028723A1 (en) | 2005-06-20 | 2005-06-20 | Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material |
US11/921,649 US7921736B2 (en) | 2005-06-20 | 2006-05-11 | Magneto-inductive flow measuring device |
RU2008102111/28A RU2385448C2 (en) | 2005-06-20 | 2006-05-11 | Magnetic induction flow metre (versions) |
EP06763121.8A EP1893951B1 (en) | 2005-06-20 | 2006-05-11 | Magnetically inductive flowmeter |
CNB2006800213406A CN100545587C (en) | 2005-06-20 | 2006-05-11 | Magnetic induction flowmeter |
PCT/EP2006/062240 WO2006136482A1 (en) | 2005-06-20 | 2006-05-11 | Magnetically inductive flowmeter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005028723A DE102005028723A1 (en) | 2005-06-20 | 2005-06-20 | Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102005028723A1 true DE102005028723A1 (en) | 2006-12-28 |
Family
ID=36976489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102005028723A Withdrawn DE102005028723A1 (en) | 2005-06-20 | 2005-06-20 | Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material |
Country Status (6)
Country | Link |
---|---|
US (1) | US7921736B2 (en) |
EP (1) | EP1893951B1 (en) |
CN (1) | CN100545587C (en) |
DE (1) | DE102005028723A1 (en) |
RU (1) | RU2385448C2 (en) |
WO (1) | WO2006136482A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007015368A1 (en) * | 2007-03-28 | 2008-10-02 | Endress + Hauser Flowtec Ag | Method for operating a magnetic-inductive flowmeter |
WO2014154395A1 (en) * | 2013-03-28 | 2014-10-02 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow measurement device |
DE102022121564A1 (en) | 2022-08-25 | 2024-03-07 | Endress+Hauser Flowtec Ag | Method for determining a flow velocity-dependent measurement variable |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005028723A1 (en) | 2005-06-20 | 2006-12-28 | Endress + Hauser Flowtec Ag | Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material |
DE102005050655A1 (en) * | 2005-10-20 | 2007-04-26 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
CN101906953B (en) * | 2010-08-11 | 2013-01-09 | 江苏省金峰石油机械制造有限公司 | Vertical long ring rack oil pumping unit |
US8783088B2 (en) * | 2011-01-21 | 2014-07-22 | Daniel Measurement And Control, Inc. | Apparatus and method for determining displacer position in a flowmeter prover |
DE102014004122B3 (en) * | 2014-03-24 | 2015-08-06 | Krohne Messtechnik Gmbh | Magnetic-inductive flowmeter and method for operating a magnetic-inductive flowmeter |
CN110296743B (en) * | 2018-03-21 | 2020-10-09 | 上海凡宜科技电子有限公司 | Method for calculating flow rate using electromagnetic flowmeter |
CN109084856B (en) * | 2018-07-19 | 2021-06-04 | 中国神华能源股份有限公司 | Flow measuring method for open circulating water system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5677496A (en) * | 1996-02-26 | 1997-10-14 | Aichi Tokei Denki Co., Ltd. | Electromagnetic flow meter removing influence of fluctuation in direct-current offset voltage |
EP1249687A2 (en) * | 2001-04-10 | 2002-10-16 | Krohne Messtechnik Gmbh & Co. Kg | Magnetic-inductive flow sensor and magnetic-inductive flow measuring method |
DE10346409A1 (en) * | 2003-10-07 | 2005-05-25 | Abb Patent Gmbh | Magnetic inductive fluid flow sensor uses operational amplifier impedance transformer DC output voltage to derive medium level and conductivity in measurement tube |
Family Cites Families (4)
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DE3269784D1 (en) * | 1981-05-15 | 1986-04-17 | Licentia Gmbh | Method for measuring ionic concentrations |
US7068054B2 (en) * | 2002-06-01 | 2006-06-27 | Worcester Polytechnic Institute | Real-time carbon sensor for measuring concentration profiles in carburized steel |
AT6511U3 (en) * | 2003-07-16 | 2004-09-27 | Avl List Gmbh | ULTRASONIC GAS FLOW SENSOR AND DEVICE FOR MEASURING EXHAUST GAS FLOWS FROM COMBUSTION ENGINES AND A METHOD FOR DETERMINING THE FLOW OF GASES |
DE102005028723A1 (en) | 2005-06-20 | 2006-12-28 | Endress + Hauser Flowtec Ag | Magnetically inductive flowmeter has first measuring electrode which is produced from first material and second measuring electrode from second material that is different from first material |
-
2005
- 2005-06-20 DE DE102005028723A patent/DE102005028723A1/en not_active Withdrawn
-
2006
- 2006-05-11 WO PCT/EP2006/062240 patent/WO2006136482A1/en active Application Filing
- 2006-05-11 RU RU2008102111/28A patent/RU2385448C2/en not_active IP Right Cessation
- 2006-05-11 CN CNB2006800213406A patent/CN100545587C/en not_active Expired - Fee Related
- 2006-05-11 US US11/921,649 patent/US7921736B2/en not_active Expired - Fee Related
- 2006-05-11 EP EP06763121.8A patent/EP1893951B1/en not_active Not-in-force
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5677496A (en) * | 1996-02-26 | 1997-10-14 | Aichi Tokei Denki Co., Ltd. | Electromagnetic flow meter removing influence of fluctuation in direct-current offset voltage |
EP1249687A2 (en) * | 2001-04-10 | 2002-10-16 | Krohne Messtechnik Gmbh & Co. Kg | Magnetic-inductive flow sensor and magnetic-inductive flow measuring method |
DE10346409A1 (en) * | 2003-10-07 | 2005-05-25 | Abb Patent Gmbh | Magnetic inductive fluid flow sensor uses operational amplifier impedance transformer DC output voltage to derive medium level and conductivity in measurement tube |
Non-Patent Citations (4)
Title |
---|
BONFIG,K.W.: Elektrochemische Störspannungen an den Elektroden bei der induktiven Durchflußmessung.Teil II: Einflüsse auf die Unsymmetrie spannung.In: ATM,Archiv für techn.Messen,H.7,1971,S.135-138 * |
BONFIG,K.W.: Elektrochemische Störspannungen an den Elektroden bei der induktiven Durchflußmessung.Teil II: Einflüsse auf die Unsymmetrie spannung.In: ATM,Archiv für techn.Messen,H.7,1971,S.135-138; |
KRAFT,Rainer,BUDMIGER,Thomas: Erweiterte Diagnose bei magnetisch- induktiven Durchflussmessgeräten. In: atp,H.4,43,2001,S.50-54 * |
KRAFT,Rainer,BUDMIGER,Thomas: Erweiterte Diagnose bei magnetisch- induktiven Durchflussmessgeräten. In: atp,H.4,43,2001,S.50-54; |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007015368A1 (en) * | 2007-03-28 | 2008-10-02 | Endress + Hauser Flowtec Ag | Method for operating a magnetic-inductive flowmeter |
US7788046B2 (en) | 2007-03-28 | 2010-08-31 | Endress + Hauser Flowtec Ag | Method for operating a magneto-inductive flow measuring device |
WO2014154395A1 (en) * | 2013-03-28 | 2014-10-02 | Endress+Hauser Flowtec Ag | Magnetic-inductive flow measurement device |
DE102022121564A1 (en) | 2022-08-25 | 2024-03-07 | Endress+Hauser Flowtec Ag | Method for determining a flow velocity-dependent measurement variable |
Also Published As
Publication number | Publication date |
---|---|
EP1893951B1 (en) | 2016-06-29 |
WO2006136482A1 (en) | 2006-12-28 |
CN101198840A (en) | 2008-06-11 |
US7921736B2 (en) | 2011-04-12 |
US20090266176A1 (en) | 2009-10-29 |
RU2385448C2 (en) | 2010-03-27 |
CN100545587C (en) | 2009-09-30 |
EP1893951A1 (en) | 2008-03-05 |
RU2008102111A (en) | 2009-07-27 |
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